Holistic Assessment of SO2 Injections Using CESM1(WACCM): Introduction to the Special Issue

Kravitz, Ben; MacMartin, Douglas G.; Tilmes, Simone; Richter, Jadwiga H.; Mills, Michael J.; Lamarque, Jean‐Francois; Tribbia, Joseph; Large, William

doi:10.1029/2018JD029293

Title: Holistic Assessment of SO₂ Injections Using CESM1(WACCM): Introduction to the Special Issue

Journal Article · Fri Oct 26 00:00:00 EDT 2018 · Journal of Geophysical Research: Atmospheres

DOI:https://doi.org/10.1029/2018JD029293· OSTI ID:1507530

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Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Atmospheric Science and Global Change Div. (ASGC)
Cornell Univ., Ithaca, NY (United States). Sibley School of Mechanical and Aerospace Engineering
National Center for Atmospheric Research, Boulder, CO (United States). Atmospheric Chemistry Observations and Modeling Group
National Center for Atmospheric Research, Boulder, CO (United States). Climate and Global Dynamics Group

We introduce a special issue on a holistic assessment of geoengineering via stratospheric SO₂ injection in the state-of-the-art climate model, Community Earth System Model, version 1 with the Whole Atmosphere Community Climate Model as its atmospheric component (CESM1(WACCM)). This model has numerous complexities that allow it to represent some of the most important nonlinearities associated with stratospheric SO₂ injection, including aerosol microphysical growth and stratospheric chemistry. The studies described herein represent the steps towards and first attempt in a state-of-the-art climate model to use geoengineering to meet multiple simultaneous objectives via SO₂ injection at multiple locations. First, a “matrix” of simulations was carried out to better understand the response of geoengineering to variations in latitude, altitude, and amount of sulfur dioxide injections. Subsequently, in a century long simulation, a feedback algorithm was employed to meet specific objectives and manage uncertainty, wherein the injection amount at each location was adjusted every model year. Most of the analyses contained in this special issue focus on surface climate and stratospheric changes in the matrix and century long simulations. In addition, 20 ensemble members of the feedback simulation have been carried out and provided to the community to expand the scope of analyses to low signal-to-noise ratio fields, including regional effects, impacts assessment, and extreme events. The demonstration provided by these simulations is a step toward understanding the space of achievable climate objectives via geoengineering, or, phrased differently, determining what geoengineering can do and what it cannot do.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1507530

Report Number(s):: PNNL-SA-136054

Journal Information:: Journal of Geophysical Research: Atmospheres, Vol. 124, Issue 2; ISSN 2169-897X

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 1 work

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Title: Holistic Assessment of SO2 Injections Using CESM1(WACCM): Introduction to the Special Issue

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Title: Holistic Assessment of SO₂ Injections Using CESM1(WACCM): Introduction to the Special Issue